Yes, seems that you understand English language, congrats.
Next time buy a X99/X299 or even more modern motherboard with chipset PCIe Bifurcation, then you can fill this adapter card with 4 disks.
Read and learn:
Why do we need PCIe BiFurcation and how? (10gtek.com)
PCIe Bifurcation & Lanes - Sabrent
When then motherboard doesnt support it, then a more expensive adapter is needed… not your 22€ cheap adapter:
Dual M.2 NVMe Ports to PCIe 3.0 x16 Bifurcation Riser Controller - Support Non-BiFurcation Motherboard - SI-PEX40129 (sybausa.com)
EDIT: Sorry, no time for it, your task only and your time not mine, google is your friend…
The technical term for searching is PCIe Bifurcation, for motherboards or adapters.